SQL - Allocations vs PostAP.Outstanding

--select * from postap p where p.AccountLink = 868


declare @vendorId bigint = 868
;with AllocValues as (
SELECT 
		p.AccountLink,p.AutoIdx, CmD = p.Credit - p.Debit,
		p.Outstanding, p.fForeignOutstanding	
		,SUM(a.fAmount) as AllocAmount
		,SUM(a.fForeignAmount) as AllocAmountForeign
		,AllocOutstanding = (p.Credit - p.Debit)-
			COALESCE(CASE WHEN p.Credit > 0 THEN  1 ELSE -1 END * SUM(a.fAmount),0)
		,AllocOutstandingForeign = ROUND((p.fForeignCredit - p.fForeignDebit)-
			COALESCE(CASE WHEN p.fForeignCredit > 0 THEN  1 ELSE -1 END * SUM(a.fForeignAmount),0),2)
	from PostAP p 
	OUTER APPLY _as_GL_AllocsSplit_NTEXT(p.cAllocs) a
	--where p.AccountLink = 868
	GROUP BY 
		p.AccountLink,p.AutoIdx, p.Outstanding, p.fForeignOutstanding,p.Credit, p.Debit,p.fForeignCredit, p.fForeignDebit
		)
	select *
		,DiffHC = Outstanding - AllocOutstanding
		,DiffFC = fForeignOutstanding - AllocOutstandingForeign
		from AllocValues A
		WHERE 
			ABS(Outstanding - AllocOutstanding) > 0.01
			OR 
			ABS(fForeignOutstanding - AllocOutstandingForeign) > 0.01